Installing a K8s cluster on Debian Bullseye with KVM

Five years ago I wrote this blog entry talking about KVM, at that time I needed to run Microsft Windows 7 VM to make some tests for my work. This time I need to make a lab with a couple of VMs to run a Kubernetes cluster in my laptop and I've decided to use … Continue reading Installing a K8s cluster on Debian Bullseye with KVM

Fixing problems with bluetooth on Thinkpad T470p

Trying to connect my bluetooth headphones I realize that I had a problem in my laptop, checking logs it shown the problem:The device installed on Thinkpad T470p is Intel 8265 Wireless Bluetooth. ... [ 7.726547] Bluetooth: hci0: Debug lock is disabled [ 7.726549] Bluetooth: hci0: Minimum firmware build 1 week 10 2014 [ 7.726564] bluetooth … Continue reading Fixing problems with bluetooth on Thinkpad T470p

Problems creating a new RAID array on Debian GNU/Linux Bullseye

A quick entry to remember a problem which I found creating a new RAID array on my Debian box. 1. This is not a problem is just a reminder: when you create a partition in a hard drive with a GPT label you need to setup as partition type 29 (Linux RAID) instead of partition … Continue reading Problems creating a new RAID array on Debian GNU/Linux Bullseye

RAID array migration from CentOS 7 to Debian GNU/Linux 10 (upgrading drives)

After installing Debian GNU/Linux Testing (Bullseye) on my HP Proliant G8 Microserver in a new SSD drive, I have to setup an already created RAID array on my new fresh Linux installation and upgrade disks in that array at the same time, these are the steps which I followed: Scan RAID arrays # mdadm --detail … Continue reading RAID array migration from CentOS 7 to Debian GNU/Linux 10 (upgrading drives)

Installing GRUB2 on USB stick on Debian GNU/Linux Bullseye

This quick entry has been created just to document the process needed to install GRUB2 from a running Debian Bullseye, trying to install GRUB2 on USB stick I always get this error: # grub-install /dev/sdb Installing for i386-pc platform. grub-install: warning: Attempting to install GRUB to a disk with multiple partition labels. This is not … Continue reading Installing GRUB2 on USB stick on Debian GNU/Linux Bullseye

Post installation setup and checks pfsense

This entry explains some steps I made when I had to reinstall my router due to a problem explained here. Checking Hard drive performance Let's check hard drive performance: /root: diskinfo -t /dev/ada0s1a /dev/ada0s1a ... TS32GMSA370 # Disk descr. D007501916 # Disk ident. Yes # TRIM/UNMAP support Seek times: Full stroke: 250 iter in 0.025302 … Continue reading Post installation setup and checks pfsense

Recover information when pfsense router doesn’t boot

In this entry I'm going to explain how I could recover information from my router (APU1D4) when router doesn't boot. Since a couple of days I get this error message booting device: elf64_loadimage: failed to read section headers I have to say that I had installed pfSense 2.4.2-RELEASE on my router, this distribution is based … Continue reading Recover information when pfsense router doesn’t boot

Opening lines from an old poem

These beautiful opening lines come from The Hymn of Empedocles from Matthew Arnold (1822 - 1888): IS it so small a thing To have enjoy'd the sun, To have lived light in the spring, To have loved, to have thought, to have done; To have advanced true friends, and beat down baffing foes; ...

Hardening SSH connections on pfSense (part II)

In some special situations, or not so special, you want to trace user sessions, for example in a critical server or when you find weird behaviors in your system. In a previous entry I explained how to setup a user account just to make SSH tunnels what is preventing from opening shells in your systems … Continue reading Hardening SSH connections on pfSense (part II)